v3.26.3
Fair Value Measurements - Schedule of Costs and Fair Values of Investments in Debt Securities Held in Decommissioning Trust Fund (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Cost    
Less than 5 years $ 36,064 $ 23,565
5 years to 10 years 0 0
Due after 10 years 0 0
Total 36,064 23,565
Estimated Fair Value    
Less than 5 years 35,930 23,707
5 years to 10 years 0 0
Due after 10 years 0 0
Total $ 35,930 $ 23,707